annotate graal/com.oracle.max.asm/src/com/oracle/max/asm/Buffer.java @ 4155:394404b2d9bd

Removed strict requirement for GRAAL environment variable. It only needs to be set now if the graal directory is not in the directory hierarchy of GraalVM JDK.
author Doug Simon <doug.simon@oracle.com>
date Wed, 21 Dec 2011 11:25:27 +0100
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children
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1 /*
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.max.asm;
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24
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25 import java.util.*;
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26
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27 /**
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28 * Code buffer management for the assembler. Support for little endian and big endian architectures is implemented using subclasses.
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29 */
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30 public abstract class Buffer {
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31 protected byte[] data;
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32 protected int position;
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33
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34 public Buffer() {
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35 data = new byte[AsmOptions.InitialCodeBufferSize];
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36 }
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37
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38 public void reset() {
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39 position = 0;
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40 }
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41
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42 public int position() {
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43 return position;
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44 }
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45
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46 public void setPosition(int position) {
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47 assert position >= 0 && position <= data.length;
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48 this.position = position;
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49 }
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50
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51 /**
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52 * Closes this buffer. No extra data can be written to this buffer after
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53 * this call.
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54 *
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55 * @param trimmedCopy
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56 * if {@code true}, then a copy of the underlying byte array up
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57 * to (but not including) {@code position()} is returned
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58 * @return the data in this buffer or a trimmed copy if {@code trimmedCopy}
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59 * is {@code true}
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60 */
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61 public byte[] close(boolean trimmedCopy) {
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62 byte[] result = trimmedCopy ? Arrays.copyOf(data, position()) : data;
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63 data = null;
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64 return result;
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65 }
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66
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67 public byte[] copyData(int start, int end) {
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68 return Arrays.copyOfRange(data, start, end);
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69 }
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70
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71 /**
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72 * Copies the data from this buffer into a given array.
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73 *
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74 * @param dst
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75 * the destination array
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76 * @param off
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77 * starting position in {@code dst}
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78 * @param len
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79 * number of bytes to copy
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80 */
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81 public void copyInto(byte[] dst, int off, int len) {
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82 System.arraycopy(data, 0, dst, off, len);
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83 }
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84
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85 protected void ensureSize(int length) {
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86 if (length >= data.length) {
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87 data = Arrays.copyOf(data, length * 4);
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88 }
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89 }
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90
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91 public void emitBytes(byte[] arr, int off, int len) {
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92 ensureSize(position + len);
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93 System.arraycopy(arr, off, data, position, len);
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94 position += len;
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95 }
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96
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97 public void emitByte(int b) {
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98 position = emitByte(b, position);
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99 }
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100
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101 public void emitShort(int b) {
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102 position = emitShort(b, position);
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103 }
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104
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105 public void emitInt(int b) {
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106 position = emitInt(b, position);
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107 }
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108
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109 public void emitLong(long b) {
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110 position = emitLong(b, position);
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111 }
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112
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113 public int emitByte(int b, int pos) {
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114 assert NumUtil.isUByte(b);
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115 int newPos = pos + 1;
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116 ensureSize(newPos);
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117 data[pos] = (byte) (b & 0xFF);
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118 return newPos;
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119 }
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120
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121 public abstract int emitShort(int b, int pos);
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122
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123 public abstract int emitInt(int b, int pos);
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124
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125 public abstract int emitLong(long b, int pos);
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126
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127 public int getByte(int pos) {
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128 return data[pos] & 0xff;
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129 }
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130
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131 public abstract int getShort(int pos);
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132
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133 public abstract int getInt(int pos);
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134
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135 public static final class BigEndian extends Buffer {
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136 @Override
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137 public int emitShort(int b, int pos) {
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138 assert NumUtil.isUShort(b);
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139 int newPos = pos + 2;
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140 ensureSize(pos + 2);
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141 data[pos] = (byte) ((b >> 8) & 0xFF);
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142 data[pos + 1] = (byte) (b & 0xFF);
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143 return newPos;
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parents:
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144 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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145
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
146 @Override
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147 public int emitInt(int b, int pos) {
4142
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148 int newPos = pos + 4;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
149 ensureSize(newPos);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
150 data[pos] = (byte) ((b >> 24) & 0xFF);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
151 data[pos + 1] = (byte) ((b >> 16) & 0xFF);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
152 data[pos + 2] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
153 data[pos + 3] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
154 return newPos;
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
155 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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156
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
157 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
158 public int emitLong(long b, int pos) {
4142
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diff changeset
159 int newPos = pos + 8;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
160 ensureSize(newPos);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
161 data[pos] = (byte) ((b >> 56) & 0xFF);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
162 data[pos + 1] = (byte) ((b >> 48) & 0xFF);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
163 data[pos + 2] = (byte) ((b >> 40) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
164 data[pos + 3] = (byte) ((b >> 32) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
165 data[pos + 4] = (byte) ((b >> 24) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
166 data[pos + 5] = (byte) ((b >> 16) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
167 data[pos + 6] = (byte) ((b >> 8) & 0xFF);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
168 data[pos + 7] = (byte) (b & 0xFF);
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diff changeset
169 return newPos;
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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170 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
171
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
172 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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173 public int getShort(int pos) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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174 return
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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175 (data[pos + 0] & 0xff) << 8 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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176 (data[pos + 1] & 0xff) << 0;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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177 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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178
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
179 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
180 public int getInt(int pos) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
181 return
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
182 (data[pos + 0] & 0xff) << 24 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
183 (data[pos + 1] & 0xff) << 16 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
184 (data[pos + 2] & 0xff) << 8 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
185 (data[pos + 3] & 0xff) << 0;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
186 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
187 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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188
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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189 public static final class LittleEndian extends Buffer {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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190 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
191 public int emitShort(int b, int pos) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
192 assert NumUtil.isUShort(b);
4142
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
193 int newPos = pos + 2;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
194 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
195 data[pos] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
196 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
197 return newPos;
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
198 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
199
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
200 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
201 public int emitInt(int b, int pos) {
4142
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
202 int newPos = pos + 4;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
203 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
204 data[pos] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
205 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
206 data[pos + 2] = (byte) ((b >> 16) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
207 data[pos + 3] = (byte) ((b >> 24) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
208 return newPos;
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
209 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
210
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
211 @Override
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
212 public int emitLong(long b, int pos) {
4142
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
213 int newPos = pos + 8;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
214 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
215 data[pos] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
216 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
217 data[pos + 2] = (byte) ((b >> 16) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
218 data[pos + 3] = (byte) ((b >> 24) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
219 data[pos + 4] = (byte) ((b >> 32) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
220 data[pos + 5] = (byte) ((b >> 40) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
221 data[pos + 6] = (byte) ((b >> 48) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
222 data[pos + 7] = (byte) ((b >> 56) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
223 return newPos;
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
224 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
225
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
226 @Override
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
227 public int getShort(int pos) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
228 return
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
229 (data[pos + 1] & 0xff) << 8 |
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
230 (data[pos + 0] & 0xff) << 0;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
231 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
232
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
233 @Override
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
234 public int getInt(int pos) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
235 return
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
236 (data[pos + 3] & 0xff) << 24 |
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
237 (data[pos + 2] & 0xff) << 16 |
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
238 (data[pos + 1] & 0xff) << 8 |
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
239 (data[pos + 0] & 0xff) << 0;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
240 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
241 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
242 }